Planning for the weather is a good way to make your trip to Tailandia relaxing and enjoyable, especially when you're splurging. The hottest months are usually October and September, with an average temperature of 28°C, while the coldest months are January and February, with an average of 26°C. The rainiest months in Tailandia are March, April, February and May, with each month seeing an average of 502 mm of rainfall.